| 引用本文: | 许畅,王聪,高晶波,张春芳.基于摄像测量法的在轨柔性结构模态参数辨识[J].哈尔滨工业大学学报,2014,46(11):17.DOI:10.11918/j.issn.0367-6234.2014.11.003 |
| XU Chang,WANG Cong,GAO Jingbo,ZHANG Chunfang.Videogrammetric based modal identification of on-orbit flexible structures[J].Journal of Harbin Institute of Technology,2014,46(11):17.DOI:10.11918/j.issn.0367-6234.2014.11.003 |
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| 摘要: |
| 针对在轨传感器布置困难的问题,提出一种利用数字摄像测量技术对在轨大型柔性结构进行模态参数辨识的方法. 阐述了三维动态重构技术、相机标定算法和像素点特征提取算法原理. 利用一类柔性星载天线模型进行了地面试验,采用高速数字摄像机记录模型的自由振动响应过程,并从采集的图像序列中提取给定测点的位移振动数据,通过特征系统实现法(ERA)辨识星载天线模型的前5阶固有频率、阻尼比等模态参数. 结果表明,数字摄像测量方法可以在满足在轨测试设备简单要求的同时,有效地辨识柔性天线的在轨模态参数. |
| 关键词: 模态辨识 摄像测量 三维重构 柔性结构 |
| DOI：10.11918/j.issn.0367-6234.2014.11.003 |
| 分类号:TB123 |
| 基金项目: |
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| Videogrammetric based modal identification of on-orbit flexible structures |
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XU Chang, WANG Cong, GAO Jingbo, ZHANG Chunfang
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(School of Astronautics, Harbin Institute of Technology, 150001 Harbin, China)
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| Abstract: |
| A modal test method based on videogrammetric for large flexible structure on orbit is presented. The methods of 3D dynamic reconstruction, camera calibration and pixel extraction are described. A ground experiment is performed using a kind of antenna model and two fast cameras. Image data is acquired frame by frame during the free vibration period of the model, and vibration signals are obtained by a time series of images. The ERA method is applied to identify the modal parameters of the antenna model, and the experimental results show that the videogrammetric is a promising method for on-orbit vibration measurement which avoids the difficulty of installing accelerometers on the flexible structures. |
| Key words: modal identification videogrammetric 3D dynamic reconstruction flexible structures |
